"Happy New Year" by ABBA, the world's greatest pop group of all time (their record still unsurpassed by anyone in that genre and overall [across all genres] surpassed only by Beatles) is the most streamed turn-of-the year celebration song in the UK.
They are legends tbh. They inspired Madge to create one of the best pop albums ever
Obligatory mention: Gags, who besides herself being directly inspired by ABBA also happens to have her so far best ever album-collab w/ a dude who was such an ABBA freak that he left his country Morocco and became Swedish.